/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.flink.streaming.api.graph.util;

import org.apache.flink.annotation.Internal;
import org.apache.flink.streaming.api.graph.StreamNode;

import javax.annotation.Nullable;

import static org.apache.flink.util.Preconditions.checkNotNull;

/** Helper class to help maintain the hash info of an operator chain. */
@Internal
public final class ChainedOperatorHashInfo {
    private final byte[] generatedOperatorId;
    private final byte[] userDefinedOperatorId;
    private final StreamNode streamNode;

    ChainedOperatorHashInfo(
            final byte[] generatedOperatorId,
            @Nullable final byte[] userDefinedOperatorId,
            final StreamNode streamNode) {
        this.generatedOperatorId = checkNotNull(generatedOperatorId);
        this.userDefinedOperatorId = userDefinedOperatorId;
        this.streamNode = checkNotNull(streamNode);
    }

    public byte[] getGeneratedOperatorId() {
        return generatedOperatorId;
    }

    @Nullable
    public byte[] getUserDefinedOperatorId() {
        return userDefinedOperatorId;
    }

    public StreamNode getStreamNode() {
        return streamNode;
    }
}
